The objective of this article is to present a novel system for a secure mail exchange within a corporation. The applied solution is general enough to be implemented using a standard POP3 mail exchange protocol. Despite the fact that POP3 protocol is considered to be unsafe, in our approach no mail message in the corporate network is ever left in the plain format. It is encrypted at the moment of its transmission and while it is stored in user mailboxes. Hence, it is useless for an intruder who could possibly intercept encrypted data. The system under consideration been devised and realized at the Institute of Computer Science at the Technical University of Lodz, Poland.
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